package com.example.Interceptor;

import com.alibaba.fastjson.JSONObject;
import com.example.Filter.LoginCheckFilter;
import com.example.pojo.Result;
import com.example.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Slf4j
@Component
public class LoginCheckInterceptor implements HandlerInterceptor {
  //  private static Logger log = LoggerFactory.getLogger(LoginCheckInterceptor.class);
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {


        //获取url
        String url = request.getRequestURI().toString();
        log.info("请求的url：{}",url);

        //判断url中是否包含login，如果包含，说明是登录操作，放行
        if(url.contains("login")){
            log.info("登录操作，放行....");
            return true;
        }

        //3.获取请求头中的令牌（token）
        String jwt = request.getHeader("token");


        //4.判断令牌是否存在，如果不存在，返回错误结果（未登录）
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换成json对象  ---用阿里巴巴的fastJSON
            String notLogin = JSONObject.toJSONString(error);
            response.getWriter().write(notLogin);
            return false;
        }

        //5.解析token，如果解析失败，返回错误结果（未登录）
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {//解析失败
            e.printStackTrace();
            log.info("解析令牌失败，返回未登录的错误信息");
            Result error = Result.error("NOT_LOGIN");
            String notLogin = JSONObject.toJSONString(error);
            response.getWriter().write(notLogin);
            return false;
        }

        //放行
        log.info("令牌合法，放行");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
       System.out.println("postHandle......");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
       System.out.println("afterCompletion......");
    }
}
